Zipper Insertion-Pin Structure

ABSTRACT

A zipper insertion-pin structure comprises a first insertion pin and a second insertion pin. The first insertion pin has a first slit on an external side thereof and a base on one side opposite to the external side. The base has a socket. The second insertion pin has a second slit on an external side thereof and can be inserted into the socket. Each of the first slit and the second slit has a plurality of teeth or gradually narrows toward the center thereof. The first insertion pin and the second insertion pin grip the tapes of a zipper with the biting force thereof.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a zipper insertion-pin structure, particularly to a zipper insertion-pin structure able to enhance the biting force to zipper tapes.

2. Description of the Related Art

The conventional zippers may be categorized into nylon zippers, metallic zippers and injection-molded zippers. The insertion pins of nylon zippers and metallic zippers are fastened to tapes after they have been arranged on the tapes. The insertion pins of injection-molded zippers, together with teeth, are directly clamped to tapes in the injection-molding process, applying higher biting force to the tapes.

Refer to FIG. 1 for the conventional insertion-pin structure of nylon zippers and metallic zippers. The conventional insertion-pin structure comprises a first insertion pin 10 and a second insertion pin 12. The first insertion pin 10 is connected with a base 101, and the second insertion pin 12 is inserted into the base 101. The external sides of the first and second insertion pins 10 and 12 respectively have a first slit 102 and a second slit 122, which separately clip the tapes of the zipper. However, the first slit 102 and the second slit 122 do not contribute a main clipping force to the tapes but just clip the tapes in a weak force. The first insertion pin 10 has a first indentation 104 and a second indentation 106. The second insertion pin 12 has a third indentation 124. The first insertion pin 10 and the second insertion pin 12 are punched to form the first, second and third indentations 104, 106 and 124 after the tapes have been arranged in the first insertion pin 10 and the second insertion pin 12. The punching force compresses the first insertion pin 10 and the second insertion pin 12 to form the indentations clipping the tapes. Thereby, the tapes are firmly fastened to the insertion pins. The conventional technology needs expensive dedicated machines to punch the insertion pins accurately. Besides, the punched surfaces of the insertion pins are neither smooth nor beautiful.

Accordingly, the present invention proposes an insertion-pin structure to overcome the abovementioned problems. The technical contents and embodiments thereof are to be described in detail below.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a zipper insertion-pin structure having toothed slits or gradually-shrinking slits at two sides thereof to bite and thus fasten the tapes of the zipper, whereby the present invention can fasten the insertion pins to the tapes without punching the insertion pins, and whereby some fabrication steps of the conventional technology are saved.

Another objective of the present invention is to provide a zipper insertion-pin structure, which fastens to the tapes via biting the tapes, whereby the insertion pins fasten to the tapes more firmly and are more beautiful than the conventional insertion pins that are punched to form indentations thereon.

To achieve the abovementioned objectives, the present invention proposes a zipper insertion-pin structure, which comprises a first insertion pin and a second insertion pin. The first insertion pin has a first slit on an external side thereof and a base on one side opposite to the external side. The base has a socket. The second insertion pin has a second slit on an external side thereof and can be inserted into the socket. The first insertion pin and the second insertion pin respectively use the first slit and the second slit to grip two tapes of a zipper. Each of the first slit and the second slit has a plurality of teeth or gradually narrows toward the center thereof. The first insertion pin and the second insertion pin grip the tapes of a zipper with the biting force thereof.

Below, embodiments are described in detail to make easily understood the objectives, technical contents, characteristics and accomplishments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically shows a conventional zipper insertion-pin structure;

FIG. 2 is a perspective view schematically showing a zipper insertion-pin structure according to one embodiment of the present invention;

FIG. 3 is an exploded view schematically showing a zipper insertion-pin structure according to one embodiment of the present invention;

FIG. 4 is a perspective exploded view schematically showing a zipper insertion-pin structure according to one embodiment of the present invention; and

FIG. 5 schematically shows that a zipper insertion-pin structure bites the tapes of a zipper according to one embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Refer to FIG. 2 and FIG. 3 respectively a perspective view and an exploded view schematically showing a zipper insertion-pin structure according to one embodiment of the present invention.

The zipper insertion-pin structure of the present invention comprises a first insertion pin 20 and a second insertion pin 22. The first insertion pin 20 has a base 201. An external side of the first insertion pin 20 has a first slit 202 extending to the base 201. The base 201 has a socket 204 at one side opposite to the abovementioned external side. The socket 204 can exactly accommodate the second insertion pin 22. The external side of the socket 204 has an opening 206. The external side of the second insertion pin 22 has a second slit 222. The second insertion pin 22 can be exactly press-fitted into the socket 204 of the base 201 and secured thereinside.

In one embodiment, the first slit 202 has a plurality of teeth 224 staggered to each other. The protrusions of the teeth 224 on one side of the first slit 202 extend into the notches of the teeth 224 on the other side, whereby the biting force is enhanced. Similar to the first slit 202, the second slit 222 also has a plurality of teeth 224. Refer to FIG. 4 for another design of the first slit 202 according to one embodiment of the present invention. In FIG. 4, the first slit 202 is wider at two ends thereof and grows narrower and narrower toward the center thereof until almost no gap exists at the center thereof.

Refer to FIG. 5 a diagram schematically showing that a zipper insertion-pin structure bites the tapes of a zipper according to one embodiment of the present invention. In FIG. 5, the first insertion pin 20 and the second insertion pin 22 respectively use the teeth or the gradually-shrinking gaps of the first slit 202 and the second slit 222 to bite the tapes 24 of a zipper. The regions where the first insertion pin 20 and the second insertion pin 22 bite the tapes 24 are located at the bottoms of zipper teeth 26. As shown in FIG. 5, the teeth 224 of the second insertion pin 22 bite the tape 24. The biting force of the teeth 224 is enhanced by the fact that the protrusions of the teeth 224 on one side of the second slit 222 deep extend into the notches of the teeth 224 on the other side of the second slit 222. If the second slit 222 of the second insertion pin 22 is designed to have a gradually-shrinking gap, the very narrow gap at the center of the second slit 222 would tight bite the tape 24. Therefore, the first insertion pin 20 and the second insertion pin 22 can grip the tapes 24 with biting force. While the second insertion pin 22 and the tape 24 bitten by the second insertion pin 22 are inserted into the socket 204 of the first insertion pin 20, the tape 24 will pass the opening 206 of the base 201.

As the zipper insertion-pin structure is exempted from being punched, the appearance thereof is more smooth, integral and beautiful than the appearance of the conventional insertion-pin structure. Further, the cost for punching is saved. Furthermore, the teeth of the slits of the zipper insertion-pin structure of the present invention can grip the tapes more tight than the punching-compressing mechanism of the conventional technology. Therefore, the zipper insertion-pin structure of the present invention is less likely to loosen from the tapes, and the zipper using the present invention is less likely to malfunction in the insertion pins.

The embodiments described above are only to exemplify the present invention but not to limit the scope of the present invention. Any equivalent modification or variation according to the spirit or characteristic of the present invention is to be also included within the scope of the present invention. 

What is claimed is:
 1. A zipper insertion-pin structure comprising a first insertion pin having a first slit on an external side thereof and a base on one side opposite to said external side, wherein said base has a socket; and a second insertion pin having a second slit on an external side thereof and insertable into said socket, wherein said first insertion pin and said second insertion pin respectively use said first slit and said second slit to grip two tapes.
 2. The zipper insertion-pin structure according to claim 1, wherein said first slit has a plurality of teeth.
 3. The zipper insertion-pin structure according to claim 1, wherein said second slit gradually narrows from two ends thereof toward a center thereof.
 4. The zipper insertion-pin structure according to claim 2, wherein said second slit gradually narrows from two ends thereof toward a center thereof.
 5. The zipper insertion-pin structure according to claim 1, wherein said second slit has a plurality of teeth.
 6. The zipper insertion-pin structure according to claim 2, wherein said second slit has a plurality of teeth.
 7. The zipper insertion-pin structure according to claim 1, wherein said base has two openings respectively on two sides thereof, and wherein said two tapes together with said first insertion pin and said second insertion pin are inserted into said base respectively through said two openings.
 8. The zipper insertion-pin structure according to claim 1, wherein said first insertion pin and said second insertion pin are respectively installed at bottoms of zipper teeth of said two tapes. 